Note: I don't know how to do the first 2 questions but the 3rd question I know. PLEASE FIRST LOOK AT THE EXPLANATION. WE ARE NOT HERE TO GIVE OUT ANSWERS, BUT TO HELP YOU.
Probability that the first card is not a club is 1 minus probability that it is a club. i.e. 1 - 1/4 = 3/4 Probability that the second card is a diamond = 1/4 Probability that the first card is not a club AND the second card is a diamond is 3/4 x 1/4 = 3/16